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In Situ Polymerization and Covalent Functionalisation of Trithiocyanuric acid by MoS2 Nanosheets Resulting in Novel Nanozyme with Enhanced Peroxidase Activity

Abstract

A hydrothermal method was used to synthesise 2D MoS2. The resulting nanosheets had a 1T stacking sequence (tetragonal symmetry) as the dominant form, and some 2H stacking (hexagonal symmetry), with an interlayer basal spacing of 6.81 Å. The material was used as a catalyst in the one step polymerisation of trithiocyanuric acid (TTCA) to polythiocyanuric acid (PTCA), resulting in PTCA-functionalisation of the edge sites of the MoS2 to form a continuous, porous, polymeric network. This novel material showed enhanced peroxidase activity relative to native MoS2. Using TMB as a colorimetrically monitored co-substrate, kinetic analysis of the PTCA-MoS2 peroxidase action revealed the catalyst functioned by a ping-pong mechanism, unlike MoS2 itself where the mechanism was sequential. The PTCA-MoS2 composite exhibited a higher value of Vmax than native MoS2 for an equal quantity of catalyst, and could be used for the colorimetric measurement of H2O2 in the range 5 µM to 1000 µM (LOD = 3.8 µM, r2 = 0.992) and the indirect measurement of glucose, using glucose oxidase, in the range 20 µM to 800 µM (LOD = 18.34 µM, r2 = 0.981). The PTCA-MoS2 catalyst was stable for two months when stored at 4 oC.

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Supplementary files

Article information


Submitted
02 Sep 2019
Accepted
06 Mar 2020
First published
12 Mar 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

In Situ Polymerization and Covalent Functionalisation of Trithiocyanuric acid by MoS2 Nanosheets Resulting in Novel Nanozyme with Enhanced Peroxidase Activity

M. K. S, M. Somasundrum and W. Surareungchai, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/C9NJ04527A

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